Reamer.



C. H. MALMEDIE. BEAMER. .APPLIOATION FILED JAN. s, 1906.

909,434. l Patented Jangl2, 1909.

2 SHEETS-SHEET 1.

G. H. MALMBDIE.

BEAMER.

APPLICATION HLBD JAN. s, 190e. y

Patented Jan. 12, 1909.

2 SHEETS-SHEET 2.-

5 ze e lll am hemmt@ maw" CHARLES I-I. MALMEDIE, OF NEW DRILL AND MACHINE COMPANY, OF NEW BEDFORD, MASSACHUSETTS,

OF MASSACHUSETTS.

BEDFORD, MASSACHUSETTS, ASSIGNOR TO MORSE TWIST A CORPORATION REAIMER.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application led January 3, 1906. Serial No. 294,360.

To all whom it may concern:

Be it known that I, CHARLES I'I. MALMEDIE, a citizen of the United States, and a resident of' New Bedford, in the county of Bristol and State of' Massachusetts, have invented a new and useful Improvement in Reamers, of which the following is a specification.

My invention relates to reamers and more particularly to expansible reamers and to reamers with inserted blades.

Solid or one-piece reamers, while superior to built-up reamers, or reamers with inserted blades, in point ol' solidity, are open to the objection that they cannot be sharpened without altering their gage, and while this defect does not exist in reamers with inserted blades, the latter are, in general, in'l'erior to solid reamers in point of solidity.

It is the object of' my invention to provide a reamer with inserted blades, and which may be adjustable or expansible if desired, which for all practical purposes shall be as solid and unyielding as a solid or one-piece reamer.

In the drawings which accompany and form a part of this speciiication, I have illustrated two embodiments ol' my invention which have given good results in practice, although it is to be understood that I do not limit myselfI to those particular embodiments thereof inasmuch as many changes may be made therein without departing from the spirit of my invention.

In the drawings Figure 1 shows a side elevation of an expansible reamer; Fig. 2 shows an end view of the reamer illustrated in Fig. 1; Fig. 3 is a section of' Fig. 1, taken on the line 3 3; Fig. 4 is a section of Fig. 3 taken on the line 4-4 Fig. 5 shows in elevation a modification of the reamer illustrated in Fig. 1; Fig. 6 shows an end view of the reamer illustrated in Fig. 5; Fig. 7 is a section of' Fig. 6 taken on the line 7-7; and Fig. S shows in plan view a detail of' construction employed in the reamer shown in Figs. 5, 6 and 7.

The reamer stock 1 is provided with longitudinal slots 8, the base of each of which is parallel to the axis ol' the stock, and each slot is provided with a wedge 5, the upper surface of which is inclined to said axis, as most clearly shown in Figs. 4 and 7. A reamer blade 4, provided with a lateral extension 16, is inserted in each of' the slots 3, and is held in contact with its wedge 5 and secured to the stock 1 by means of the screws 7 which pass through said lateral extension and through the slots 6, with which the wedges are provided, and theninto threaded holes in said stock. The lower surface of each blade is so inclined to the axis of the stock that the cutting edge ol' each blade is parallel to said stoclr, so that when the screws 7 are loosened a longitudinal movement of the wedges will produce an outward movement of the blades in the direction of the radii of the stock.

A convenient means for producing such longitudinal movement of the wedges is afforded by the nut 9, which carries a slot 14, adapted to take a spanner, and in order to provide for the equal movement of all the wedges, a collar 8 may be interposed between said wedges and said nut.

In a reamer with inserted blades, the blades are often subjected to enormous strain, resulting in relative movement between the blades and the stock, and it will be apparent that such movement, however minute, will be fatal to the accurate work for which reamers are often employed. By means of the above described relatively broad lateral extensions 16, with which the blades 4 are provided, I am enabled to very firmly secure said blades to the reamer stock. Still further solidity is secured on account of the backing afforded each blade by that porj tion of the stock which coperates with the radially extending portion of said blades. I

have found in practice that a reamer so constructed is for all practical purposes as solid and unyielding as a one-piece reamer.

It is sometimes desirable that the movement of the nut 9 shall not produce a corresponding movement of the collar 8, and in order to prevent such movement of the collar, I sometimes provide the latter with recesses to receive the ends of the wedges. A reamer so constructed is shown in Fig. 5, in which the collar is shown provided with radial recesses 11.

For squaring the bottom of a hole in the metal operated u on, I may provide the blades with integra lips 12, which project beyond the forward end of the stock as shown in Figs. 6 and 7, and inasmuch as these lips are subjected to considerable strain, I may provide the forward end of the stock with radial slots 15, which receive the inner ends of the lips, as shown in Fig. 7. In case this construction is employed, it is of course necessary to provide for the outward movement of the wedges 5 by removing a corner thereof as l shown at 13 in Figs. 7 and 8.

While in Fig. 6 I have shown each'of the blades 4 provided with the aforesaid lips l2, it will be obvious that a smaller number of them may be rovided With such lips, and in practice I pre 'er to provide every other blade with a radially extending lip 12.

It will be obvious that the rinci les of the present invention may be embodie in a shell reamer as well as in a reamer of the type illustrated, and therefore I desire to be understood as employing"the word stock as meaning a support, either solid or hollow, for the elements of a reamer.

Itis well understood that if the various elements hereinbefore described are secured to a shell or hollow stock so as to form a reamer, said hollow stock is secured to a rod or cutter bar when the reamer is in operation.

for longitudinally moving said wedges and a collar, interposed between said wedges and said nut, and provided with recesses receiving the ends of said wedges.

In testimony whereof I have hereunto sub'- scribed my name this first day of January 1906.

CHARLES H. MALMEDIE.

Witnesses: o

GEORGE H. H. ALLEN, JOHN L. MARTIN. 

